Portable elevator



E. N. HESCOCK AND E. F. SMHH.

PORTABLE ELEVATOR. APPLICMIQN man FEB,1E,1920- Patented May 3, 1921.

2 SHEETSSHEET l.

E. N. HESCOCK AND E. F. SMITH.

PORTABLE ELEVATOR. APPUCAHON mu) rm. 16. \920.

Patented May 3, 1921 2 SHEETS-SHEET 2- ing mechanism normal] "UNITED STATES PATENT OFFICE.

mass 11. nnscocx,

OF WESTFIELD, NEW JERSEY, AN D ERNEST F. SMITH,

WOODHAVEN, NEW YORK, ASSIGNOBS TO NEW JERSEY FOUNDRY & 11A.- CHINE COMPANY, A CORPORATION OF NEW JERSEY PORTABLE ELEVATOR.

Specification of Letters Patent.

Patented May 3. 11921.

Application filed February 16, i920. Serial No. 353,869.

' fication, taken in connection with the accompanying drawings.

Our invention relates to portable elevators and more particularly to means to positively insure that the elevator, when in use, shall be stabilized.

, Qur invention further relates to means for preventing the hoist mechanism from being Operated unless the elevator is stabilized. Our invention further relatesto using a portion of the traction means to operate, or bring intd' play, the stabilizing means. 'Our invention further relates to having a lockcontrol the hoist mechanism, and a portion of the traction mechanism cooperating with the locking mechanism after the stabilizing mechanism has been brought into operation.

Our invention further relates to using the ordinary handle of the caster traction wheel of a movable elevator, and connecting it with suitableinstrumentalities so that the handle,

'nnd mechanism to which it is connected, will reference numerals refer to similar parts in the different figures.

Figure 1 is aside elevation of our improved portable elevator, withcertain parts omitted for purposes of clearer illustration; Fig. 2 is a lan view of the carriage of the "olevatono'mitting cartainparts connected with it; I

Fig. 3 is a side elevation, partly in vertical section of a cletaihshowing the cam yoke in the opposite. position from that shown in Fig. 1;

Fig. 4 is a detail perspective view, on an enlarged scale, of one form of locking mechanism which we may employ;

Fig. 5 is a detail view, partly in vertical section on the line 5-5 of Fig. l.

Fig. 6 is a detail perspective view of one form of catch. which we may employ, for holding the handle in its inoperative position; p

Fig. T is a side elevation, partly broken away, showing a somewhat different orrangement of locking mechanism;

Fig. 8 is a detail perspective view, on an enlarged scale, of the locking mechanism shown in Fig. 7;

Fig. 9 is a perspective view, partly, broken away, showingv another form of locking mechanism;

Fig. 10 is a detail perspective View on an enlarged scale of the same locking mechanism shown in Fig. 9, but in its opposite position; Fig. 11 is a perspective view of a different form of pawl for locking the hoist mechanism; H

Fig. 12 is a detail perspective view of still another different arrangement of for locking the hoist mechanism;

It is well known that one of the chief objections to portable elevators is that they are not stable or rigid when in operation. These portable elevators must beeasily movable from place to place in the warehouse, factory, dock, or other place where they are used. B our invention, without lessening the mohi ity of the movable ele\'jator,"or' increasing its weight. we positively ihsltre'that it will be stable when the hoist mechaiiism is operated to lift the load. It is, of conrse, understood that a comparatively small move ment or oscillation at the base oi-carriage will be greatly multiplied as the platform is raised. Such a wabbling or oscillation, when the platform is in its raised position is extremely dangerous as the load is apt "to tip or fall off the platform with serious injur to the workmen, and possible "danger or injury to the load, depending open the character of the goods being stacked or raised at that time.

By our invention we absolutely eliminate all such oscillation or wabbling of the platform or of the elevator while the hoisting mechanism is being operated.

-1nto operation by a part of 7 they will not dm Our elevator comprises the usual carria e 1, with'the traction wheels 2, 2 and 3, t e latter bein mounted as a caster wheel to permit rea y handling and manipulation of the'movable elevator in restricted passagps or other locations in which it is used. e also employ a vertical upright 4, winding drum 5, movable latform 6,'crank 7, gear wheels 8 9, 10 an 11, which ma be of any approved construction the same orming the holsting'mechanism to operate the drum 5.

On the front of the carriage 1 we mount a bracket 12, having a vertical bearing 13 for the pin 14 of the caster wheel fork 15. \Vithin this wheel fork 15 is, mounted the caster wheel 3 on the axle 16. U on this same axle 16 is mounted a cam yoke 1 which straddles the wheel fork 15. The radius of this cam oke 17 from the axle 16 to the point 18 is greater than the radius from the axle 16 to the point 19. To this cam yoke -17, We secure in an suitable manner, the bandle 20 em loy to pull or manipulate the movable e evator around to the dillerent locations where it is desired to use it.

We rovide the movable elevator with any suitabl i a form of stabilizing means which will stabilize the elevator and prevent any movement or wabbling of the platform 6 and the vertical standard 4. Any stabilizing means may be used which will be brought the traction means.- We have shown by way of illustration one form of our invention in whichthe corners 21, 21 are provided with fixed feet or legs 22, 22 which ma be secured to the carriage 1 in any suitable way. In our invention these stabilizing means give four points of support, together with the traction wheels 2 2. .ur stabilizing means are raised from the floor while the movable eleyator is being moved from place to lace, but have to be brought into contact wit the floor-23 before the h'oistln mechanism of the elevator can be .oper a In the position of the parts shown in Fi 1, the handle 20, 20 is in its operative posh tionwhich causesthe cam' yoke to move heneath the bracket 12 and in this manner lift thefeet 22, 22 free from the floor, so that or otherwise impede; the

. manipulation of t e el'evator' whil it is hemg moved from lacexto place. As soonas the elevatdrhas been positioned, where it is desired to stack. or lift oods'of anydescription, the. handle 20 is rought from the osztion shown in 1 to that shown in,

permit the entire front slightly until the feet '22, 22 are bronght'into contact with the floor in which-position the movable elevator is stabilized.

To. make the movable elevator ,fffoolproof, so that it is absolutely necessary for the operator to bring-"the stabilising mean erajave position and will give, or sprin while;. moving --alon arious forms of. locking'means cooperatin with the hoistingmechan'ism ma be use as our invention is not to be con ned Ito an particular lockin means. Preferably t e locking means cooperates with some part or element of the traction means, as for example the handle 20, which therefore performs not only the function of being a portion'of the traction means but also cooperates ivithany suitable form of locking means which looks the hoistin mechanism until the elevator has been stabi ized.

\Ve have shown in our drawings various forms of lockin means to cooperate with the hoisting mac mnism, but these are only some of the different forms that may be used, it being distinctly understood that our invention is not to be confined to any particular form of locking means.

e may mount a pawl 24, Figs. 1 and 4, upon a pin 25, secured to the frame 26. This pawl is provided with means so that normally its tooth 27 enga es with the teeth 28, 28 of the pinion 9. file preferably rovide the pawl with a weighted end 29, w ich overbalances the end 30 and insures that the contact with" the tooth 27 will normally To release the pawl inclined or wedge snrfae'e 81 so that when the cam yoke 1 isbrou ht intothe osition shown in 3, theliandle 20 perating with the inclined; surface Bl wi l=rock the pawl24 and cause its'toothfi'l to. disenga the'teeth'28, 28 of the pinion-9. wifi permit the crank 7 to. operate the hoist mechanism. i To secure the handle 20. in itspropersition to 'holdthe pawl-24 m its own inop 'we" may use any suitab e forin of catch or holding 32 is formed of a piece Offi'fitlll having one end 38 secured to the frame 26, while the other end-34 is bent ha to-form a hook. Preferably this oatc resilient amazon the Linc in'ed' surface 85- and -W1ll sprin'g' acka soonfas items has with the pinion, so that evi'ce; such,- for example, as that shown 1:1;F1g. 6,-in which the patch passed the cut] 34,118 showrf'ih' dotted and full lines in-Fig b. When the parts'ard in this position the stabilizing means, as for example the feet 22, 22, are in contact with the floor so that the movable elevator is stabilized. To move the elevator to a new position it is simply necessary to manipulate the handle 20 from contactv with the book 34 of the catch 32, bring the handle down into the position shown in Fi 1, which will cause the cam yoke 17 to lift the forward portion of the carriage 1, when the V elevator may be readily moved in its new position. The hoist mechanism cannot be operated in its new location until the handie has again been brought into position to release the locking mechanism.

The locking mechanism may be mounted to cooperate with the gear 11 or any other portion of the hoist mechanism. \Ve have shown such a construction in Figs. T and 8, where the lockingpawl 36 is pivoted on the 20 pin 37 mounted on the bracket 38 connected "withthe support 26. This pawl 38 has one end 60 cooperating with the teeth 39, 39 of the gear 11, its other end being provided with a bent portion 40 to cooperate with the handle 20. This .iawl is preferably provided witha spring =ll to insure that it will normally engage with the teeth 39 of the gear 11 to lock the hoist mechanism.

In some cases we may mount a pawl 42, Figs. 9 and 10, upon a rock shaft 42%,mo'i1nted on the elevator. The pawl engages with the gear wheel 11, or any other gear wheel of the hoist mechanism. In this form of locking mechanism We mount fast on the rock shaft 43 a cam 44: to cooperate with the handle 20, the .pawl 42 being normally thrown into contact with the teeth of the gear wheel by the spring 4:"). When the handle 20 is brought into the position shown in Fig. 3, it will move up the inclined surface 46 of the cam 44 and rock the shaft 43. causing the pawl 42 to discu gage the teeth of the gear wheel, Fig. 10.

\Ve have shown a different form of pawl 5) in Fig. 11. which is pivoted on the pin 47, one end 48 cooperating with the teeth of the-gear wheel 9. the other end 49 cooperating directly with the arm "20, as shown in full and dotted lines in this figure. To get 50 the arm 20 to bear directly upon the end l9 of the pawl 50. it is necessary to move the arm '20 and the cam yoke 17 at right angles to the position shown in Fig. 3.

In some cases we may mount a rock shaft 51 in a bearing 52 carried by the frame afid secure on one end of the shaft the pawl (53, which normally contacts with the teethiBSl,

39 of the gear wheel 11. Upon the opposite end of the rock shaft 51. we mount an 'arm 54!, against the end 55 of which the arm 20 directly contacts to rock the shaft and thereby lift the pawl 53. Any suitable means may be used to insure that the pawl '53 will "normally contact with the gear wheel 11, as for example by making the "have to be moved at right angles to the position shown in Fig. 3 so that the arm 20 may bra r upon the end of the arm 54.

Having thus described this invention in connection with illustrative embodiments thereof, to the details of which we do not desire to be limited. what is claimed as new and what is desired to secure by Letters Patent IS set forth in the appended claims.

\Vliat we claim, is 2-- 1. In a movable elevator. the combination ,of stabilizing means fast on the elevator,

hoisting mechanism, and a single control to alternately render the stabilizing and hoisting mechanism operative.

2, In a movable elevator. the combination of stabilizing means, hoisting mechanism, a lock to normally lock the hoisting mechanism. and hand operated traction means to alternately release the lock and bring the stabilizing means into operative position.

3. In a movable elevator, the combination of a carriage, stabilizing means carried by the carriage. hoisting mechanism. a lock to lock the hoisting mechanism. and means to tilt the carriage slightly at one end in a vertical plane to bring the stabilizing means into operative position, said means cooperating with the lock to release the hoisting mechanism.

t. In a movabie elevator, the combination of a carriage. stabilizing means fast on the carriage. hoisting mechanism. a. lock to lock the hoisting mechanism. and means to tilt the carriage slightly at one end in a vertical plane to bring the stabilizing means into operative position. said means cooperating with the lock to release the hoisting mechanism.

In a movable elevator the combination of a carriage. stabilizing means carried by the carriage. hoist mechanism. a lock to lock the hoist mechanism. and means to lower the carriage to bring the stabilizing means into operative position. said means co'opeirtiug with the lock to release the hoist mechanism when the carriage is lowcred.

6. In a movable elevator the combination of a carriage, stabilizing means carried by the carriage. hoist mechanism, a lock to lock the hoist mechanism, and means including a cam to lower the carriage to bring the stabilizing means into operative position, said means cooperating with the lock to release the hoist mechanism when the carriage is lowered.

7 In a movable elevator the combination of a carriage. stabilizing means carried'by the carriage, hoist mechanism. a lock to lock said hoist mechanism. traction wheels, a handle operating one of the traction wheels,

saidhandle cooperating with the look to release the hoist mechanism as the stabilizing means are brought into their operative position. 4

8. In a movable elevator the combination of a carriage, stabilizing means carried by the carriage, hoist mechanism, a lock to lock said hoist mechanism, traction wheels, a handle operating one of the traction wheels, means to tilt one end of the earriage to operate the stabilizing means, said handle cooperating with the lock to release the hoist mechanism as the stabilizin means are brought into their operative position.

9. In a movable elevator the combination of hoisting mechanism, stabilizing means, draft mechanism, a lock to lock the hoist mechanism, said draft mechanism being adapted to alternately release the lock and bring the stabilizing means into operative position.

10. In a movable elevator the combination of a carriage, hoist mechanism including gear Wheels, a, lock to look Said gear wheels, a traction wheel, a handle to move said tractlon wheel, said handle cooperating with the lock to release the hoist-mechanism. In a movable elevator the combination of.'a carriage, stabilizing means carried by the carriage, hoist mechanism including gear wheels, a lock to lock said gear wheels, a traction Wheel, a handle to move said traction wheel, said handle cooperating with the lock to release the hoist mechanism. 12. In a movable elevator the combination of a carriage, stabilizlng means, a cam yoke to tilt one end of the carriage, hoistmg mechanism, a look mechanism, a handle connected to the cam yoke and ada ted to operate it and also oooperating wit the lock to release the hoisting mechanism.

' ETHAN N. HESC'OCK.

ERNEST F. SMITH.

J. A. SGHNEITZER, REUBEN Iawm.

. Witnesses:

to lock said hoisting 

